IEEE1284_NEGOTIATION - Online Linux Manual PageSection : 3
Updated : 11/11/2010
Source : [FIXME: source]
Note : Functions

NAMEieee1284_negotiate, ieee1284_terminate − IEEE 1284 negotiation

SYNOPSIS#include <ieee1284​.h>int ieee1284_negotiate(struct parport *port, int mode); void ieee1284_terminate(struct parport *port);

DESCRIPTIONThese functions are for negotiating to and terminating from IEEE 1284 data transfer modes​. The default mode is called compatibility mode, or in other words normal printer protocol​. It is a host−to−peripheral mode only​. There are special modes that allow peripheral−to−host transfer as well, which may be negotiated to using ieee1284_negotiate​. IEEE 1284 negotiation is a process by which the host requests a transfer mode and the peripheral accepts or rejects it​. An IEEE 1284−compliant device will require a successful negotiation to a particular mode before it is used for data transfer (but simpler devices may not if they only speak one transfer mode)​. To terminate the special mode and go back to compatilibity mode use ieee1284_terminate​. These functions act on the parallel port associated with port, which must be claimed​. With a device strictly complying to IEEE 1284 you will need to call ieee1284_terminate in between any two calls to ieee1284_negotiate for modes other than M1284_COMPAT​.

AVAILABLE MODES

Uni−directional modes•  M1284_COMPAT: Compatibility mode​. Normal printer protocol​. This is not a negotiated mode, but is the default mode in absence of negotiation​. ieee1284_negotiate(port, M1284_COMPAT) is equivalent to ieee1284_terminate(port)​. This host−to−peripheral mode is used for sending data to printers, and is historically the mode that has been used for that before IEEE 1284​. •  M1284_NIBBLE: Nibble mode​. This peripheral−to−host mode uses the status lines to read data from the peripheral four bits at a time​. •  M1284_BYTE: Byte mode​. This peripheral−to−host mode uses the data lines in reverse mode to read data from the peripheral a byte at a time​.

Bi−directional modes•  M1284_ECP: ECP mode​. On entry to ECP mode it is a host−to−peripheral (i​.e​. forward) mode, but it may be set to reverse mode using ieee1284_ecp_fwd_to_rev(3)​. It is common for PC hardware to provide assistance with this mode by the use of a FIFO which the host (or, in reverse mode, the peripheral) may fill, so that the hardware can do the handshaking itself​. •  M1284_EPP: EPP mode​. In this bi−directional mode the direction of data transfer is signalled at each byte​.

Mode variations•  M1284_FLAG_DEVICEID: Device ID retrieval​. This flag may be combined with a nibble, byte, or ECP mode to notify the device that it should send its IEEE 1284 Device ID when asked for data​. •  M1284_BECP: Bounded ECP is a modification to ECP that makes it more robust at the point that the direction is changed​. (Unfortunately it is not yet implemented in the Linux kernel driver​.) •  M1284_ECPRLE: ECP with run length encoding​. In this mode, consecutive data bytes of the same value may be transferred in only a few cycles​.

RETURN VALUEE1284_OK The negotiation was successful​. E1284_NOTAVAIL Negotiation is not available with this port type​. E1284_REJECTED Negotiation was rejected by the peripheral​. E1284_NEGFAILED Negotiation failed for some reason​. Perhaps the device is not IEEE 1284 compliant​. E1284_SYS A system error occured during negotiation​. E1284_INVALIDPORT The port parameter is invalid (for instance, perhaps the port is not claimed)​.

AUTHORTim Waugh <​twaugh@redhat.com​> Author.

COPYRIGHT
Copyright © 2001-2003 Tim Waugh
0
Johanes Gumabo
Data Size   :   16,065 byte
man-ieee1284_terminate.3Build   :   2024-12-05, 20:55   :  
Visitor Screen   :   x
Visitor Counter ( page / site )   :   2 / 238,313
Visitor ID   :     :  
Visitor IP   :   3.148.144.139   :  
Visitor Provider   :   AMAZON-02   :  
Provider Position ( lat x lon )   :   39.962500 x -83.006100   :   x
Provider Accuracy Radius ( km )   :   1000   :  
Provider City   :   Columbus   :  
Provider Province   :   Ohio ,   :   ,
Provider Country   :   United States   :  
Provider Continent   :   North America   :  
Visitor Recorder   :   Version   :  
Visitor Recorder   :   Library   :  
Online Linux Manual Page   :   Version   :   Online Linux Manual Page - Fedora.40 - march=x86-64 - mtune=generic - 24.12.05
Online Linux Manual Page   :   Library   :   lib_c - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40
Online Linux Manual Page   :   Library   :   lib_m - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40
Data Base   :   Version   :   Online Linux Manual Page Database - 24.04.13 - march=x86-64 - mtune=generic - fedora-38
Data Base   :   Library   :   lib_c - 23.02.07 - march=x86-64 - mtune=generic - fedora.36

Very long time ago, I have the best tutor, Wenzel Svojanovsky . If someone knows the email address of Wenzel Svojanovsky , please send an email to johanes_gumabo@yahoo.co.id .
If error, please print screen and send to johanes_gumabo@yahoo.co.id
Under development. Support me via PayPal.